Method of uniaxially expanding a fluoropolymer product

Details Method of uniaxially expanding a fluoropolymer product Method of uniaxially expanding a fluoropolymer product

B - Operations, Transporting

29

C

B29C 55/06 (2006.01)

Patent

CA 2564964

This invention relates to a method of uniaxially expanding a fluoropolymer product including the steps of expanding a green fluoropolymer product in a first direction to create a first-expanded fluoropolymer product, and expanding the first-expanded fluoropolymer product in the same first directiom. As a result with the subject invention, it has been found that ultra-high expansion and a variety of different porous/fibril structures can be achieved by using subsequent expansion steps in the same direction. Various considerations exist with such methodology, including the selection of rates of expansion of both steps, the amount of expansion of both steps, pre-heating and cutting the product between expansion steps. Although the present invention can be used with various fluoropolymer products, it is particularly well-suited for use with PTFE

L'invention concerne un procédé d'expansion uniaxiale d'un produit fluoropolymère consistant à réaliser l'expansion d'un produit fluoropolymère vert dans une première direction afin de créer un premier produit fluoropolymère expansé, et à réaliser l'expansion du premier produit fluoropolymère dans la même direction. Selon l'invention, il a été démontré qu'il est possible d'obtenir une expansion ultra-haute et diverses structures poreuses/fibrilles par expansion successive dans la même direction. Le procédé selon l'invention peut également faire intervenir la sélection des vitesses d'expansion des deux étapes, le taux d'expansion des deux étapes, le préchauffage et la coupe du produit entre des étapes d'expansion. Bien que le procédé selon l'invention puisse être employé avec divers produits fluoropolymères, il est particulièrement destiné au PTFE.

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